Just moved from Windows Phone 7 on a HTC Trophy to Windows Phone 8 on an HTC 8X. Very please with most things, apart from the maps. Here is an aerial view map from my old phone:
And the same location on my new phone:
(These images are both Whitley Bay, UK if you want to test for yourself). It looks like the images were taken on a cloudy day. It's rubbish!
The satellite imagery on my Windows Phone is very poor in general. It's better in London - but still poor compared to WP7.